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A SQUAD OF BRUSSELS POLICEMEN WITH CYCLES, HOLDING A CROWD WAITING FOR THE

START OF A CYCLE RACE AROUND BELGIUM.

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cycle, also, for mounting a force of riflemen. They use a folding wheel and are armed with the regulation service rifle. Being picked men, and crack shots, they give excellent service as scouts, for they can cross all sorts of country, riding when possible and carrying their folded wheels when not. In their sober, dark green uniforms, with yellow trimming and cloth caps they are neat but not gaudy and are a very useful body to the service.

Sham battles are very popular with the Belgians. When one occurs the people turn out en masse to witness the spectacle. Shops are closed and the citizens arrayed in their best garments, the ladies in gaily colored finery, add interest to the maneuvers. Belgium is one of the minor military powers of Europe that dread the aggressions of their more powerful neighbors, notably Germany. Hence she represents the latest innovations in all things pertaining to military science and tactics.

The bicycles used as a regular part of their equipment by the sharp-shooters hitherto referred to are necessarily of the very lightest build and weight, compatible with strength and service; for a few pounds extra weight on a soldier's

Types of Belgian Cycle Riflemen.

back means a very serious thing if a march of some distance has to be made.

The lay of the land in Belgium is, on the whole, however, well-adapted to bicycle riding, and it is not for very long periods that these strangely mounted scouts and sharp-shooters have to carry their vehicles.

Seeing Through a Brick

By Livingston Wright

O ANA DUDLEY of Wake. ening paper or magazine to a comfortable

field, a suburban town of parental peep at your dear little tots in Boston, has devised the ap- the nursery above. Indeed, if you should

plication of the "seeing- feel disposed to peer over into the next Pues through-a-brick" principle county or the next state you can look at

to a machine which will en- your business friend' the while you talk able you while seated in your luxurious with him over the 'phone. Dudley's office chair or your comfortable, lazy brain has hatched the basic contrivance library chair, to turn to a sort of “re- that will enable you to do these very ceiver” and take a squint at what your things and many others as wonderful. employees are doing 'way up at the south- It may be that Dudley will never reeast corner of the 'steenth floor above alize his deserved fortune from his presyou, or turn from the pages of your ev- ent “seeing-through-a-brick” device, but

there is little question that his invention will be added to and perfected by others, so that vast manufactories will find it as indispensable as the telephone, houses will have it as much a matter of equipment as open plumbing, great office buildings will be using it to communicate with other great office buildings hundreds of miles away.

For, there are times and callings when for a man to gaze upon the distant face of another may be just as consequential as to hear that person's voice. Think of what it would mean for a manufacturer to have the power of quietly and unsuspectedly watching his employees while they are at work. Think of what it would mean for the bank official to be able at any moment he might choose, to peer into the bank vault just before he goes to bed! Or for the lawyer in a city court room to see the face of a prospective witness fifty miles distant the while he talks with him over the 'phone!

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THE INVENTOR AT HIS INSTRUMENT.

And these things are but hints of the multitudinous possibilities of a machine that will enable you to see for business and household needs to the same extent practically that the telephone enables you to hear.

Dudley's idea has been to develop the contrivance by which, years ago, you went to a county fair and in a tencent “side show” “saw through a brick," that is, a square tube in the form of a half-square

PHOTOGRAPH TAKEN THROUGH "TELESCOPE SYSTEM." .

The person photographed was several hundred feet away from camera, and out was fitted around a common paving brick. At the angles were fitted slanting mirrors. graph a person who is many hundreds of You peered in at one opening and the feet or rods away, out of ordinary sight rays of light coming in at the other open- and on a floor or elevation hundreds of ing were deflected by the two mirrors so feet higher or lower than the person opthat you literally saw what was on the erating the camera. Another valuable other side of the opaque brick.

development feature is that by the use The inventor calls his device the of ordinary artificial light at each re“United Telescope and Telephone Sys- ceiver the operator can get better results tem” or house to house telescope system. even than with daylight. Thus, a priBut the name is the poorest part of his vate watchman could thoroughly inspect invention and gives little idea of the pos- a great factory by simply using the resibilities of the thing.

ceiver of one of these seeing-through-aDudley's training for inventing has brick machines in his bunk room, turning been long and thorough. He worked on the electric bulbs for each floor and for a number of years in the railroad each room. shops at St. Paul and is a practical ma- The test of an invention is: Is there a chinist in every way. It was Dana Dud- need for it and will it work? Dana ley, it is asserted, who invented the dy- Dudley's telescope scheme answers namite gun which is now used on every “Yes” to these two questions. Just as torpedo boat. This was in 1889. He the telephone has been improved and has now a $26,000 suit pending in the adapted by myriads of switches and conFederal courts over his claim on royal- trivances for numberless needs and uses, ties from the dynamite gun invention. it is entirely probable that the seeing

So effective is the seeing-through-a- through-a-brick idea will be so develbrick device that one may eaşily photo- oped.

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of ordinary sight.

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Are you worried by any question in Engineering or the Mechanic Arts? Put the question into writing and mail it to the Consulting Department, TECHNICAL WORLD MAGAZINE. We have made arrangements to have all such questions answered by a staff of consulting engineers and other experts whose services have been specially enlisted for that purpose. If the question asked is of general interest, the answer will be published in the magazine. If of only personal interest, the answer will be sent by mail, provided a stamped and addressed envelope is enclosed with the question. Requests for information as to where desired articles can be purchased, will also be cheerfully answered.

Dim Electric Lights

in turn will weaken and you will still I have a small incandescent lamp which I

h. I

have

have the fifth cell to throw in series. In am operating from three dry cells in series. this manner the original three cells may After using these cells for two or three weeks, be worked until they are practically exthe light grows dim, although the cells do not

hausted before being thrown away. If seem to be exhausted. Can you suggest á remedy for this ?-A. E.

you were operating your lamp continu

ously for any great length of time, the The accompanying sketch shows five

use of dry cells would not be advisable, dry cells connected in such a manner that

as they are not suited for this kind of by means of a three point switch the lamp

service. may be placed in series with three cells, four cells or five cells. As the original three cells weaken, it will be found neces

Waterproof Glue . sary to place another cell in series to I should be pleased to have you print a keep the voltage high enough for satis- formula for making a good waterproof glue.factory operation of the lamp. This cell 1.A.J.

Dissolve separately in ether, under the influence of a gentle heat three parts gum shellac and one part india rubber by weight. Mix the two together, after dissolution, and seal for a time in an airtight vessel. When ready for use, the glue will be found to resist the action of water, both hot and cold, as well as of most acids and alkalies. If ether is mixed with the glue, it may be applied to leather as a varnish along the seams

where they have been sewn together, and TO REMEDY Dim Electric Light.

gives a waterproof surface.

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Handling Hot Main Bearing having suitably sized jaws for the joint 1. How should a hot main bearing be and that have been heated sufficiently handled?

to melt the solder. Scrape all the scale 2 What kind of lubricant is used for ordi- off between the jaws with an old file; nary machinery, for valves and pistons, and for high and slow speed engine bearings ?–S. C.

The first thing to do is to start your oil feeding as rapidly as possible, then slacken off the set screws or wedges, applying the oil freely, mingled with a little water. If the bearing becomes "smoking” hot, slow the engine down, but keep “her” "turning over.” If the bearing begins to cool off and the babbitt has not

11, UTHYE LIVIT run, you may speed up the engine to full speed with safety, but keeping a close watch on the bearing until you are satisfied that it is back to its normal condition again.

Don't slacken off the set screws or wedges too much, for an engine will pound itself hot if the bearings are too loose.

If the babbitt has run badly, it will be necessary to jack up the shaft, take out the shells, have them re-babbitted, bored and scraped to a true surface, in the same manner as crank pin brasses are ordinarily handled.

To handle a hot main bearing is a simple matter in comparison with a hot crank pin, because one can usually

SEED-CORN RACK. slacken off the set screws or wedges, while the engine is in motion, so as to hold the joint with the hot tongs until make it run loosely and enable you to the solder has thoroughly melted ; remove keep the engine in motion.

the hot tongs carefully and follow up 2. For ordinary machinery use min

with another pair heated to show a dull eral, vegetable or lard oil. For valves red, which will set the solder and preand pistons use heavy mineral high test vent the joint from being chilled too oils and little graphite. For engine suddenly. The joint can then be dressed bearings use castor, sperm or some heavy . to the thickness of the saw blade. It mineral oil.

would be as well to have a pair of cold

tongs to clamp the hot jaws firmly to the Joining Band Saws

joint, as the hot iron must fit nicely over Please give directions for joining small band

the whole width of the saw. In joining, saws.-A. F. W.

do not make the lap longer than is absoThe parts to be joined must be bev lutely necessary. eled to a nice fit. Secure the saw at both ends in clamps. See that the edges are

A Seed-Corn Rack parallel, or a short and a long edge will

I should like to have you make a diagram, be the result, which will cause the saw to or give a description of a rack for storing seedrun badly and to break on the short edge corn.-H. G. H. when strained. Put on the filed parts a The following method has been sugthin coat of borax paste. Cut a piece of gested by Mr. G. I. Christie of the Purvery thin sheet silver solder of the same due University Experiment Station: To size as the joint to be made, which place secure a thorough circulation of pure air, between the lap. Take a pair of tongs corn after being picked should be hung

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