February 21, 1890.] 



SCIENCE. 



135 



to which a pad of drawing-paper is fastened, and a wooden T- 

 square and triangles of suitable size. The draughtsman or 

 architect fastens the piece of paper on which he is working to 

 his drawing-board by means of thumb-tacks ; but this method 

 has proved both expensive and annoying in the primary gi'ades of 

 schools, so the scheme of the pad has been devised. This pad is 

 slightly glued to the board at each corner, and the sheets com- 



<Z^ 



posing it are torn off one by one as fast as they are used. The 

 pads are sold separately from the boards, and can be renewed as 

 often as circumstances require. The T-square is a substantial in- 

 strument, having a blade fourteen inches long. The head is 

 adapted for use with the pad, as well as the single sheet, being 

 unusually thick, so as to allow it to have a hold on the board 

 when the pad is of full thic :riangles, commonly 



called the 45° and 60° triangles, include the standard angles, 

 90°, 45°, 60°, and 30°. 



As a convenience in keeping the several pieces of the set to- 

 gether, the back of the board is provided with grooved cleats, and 

 the cross-cleats at the two ends of the board are slotted to receive 

 the tongue of the T-square, as shown in Fig. 2. 



A few sample boards were placed in the schools of Sjiringfield, 

 Mass. , by way of experiment, tlu'ee years ago, and since that time 

 their use has spread to such cities as Providence, R.I. ; Hartford, 



Comi. ; Harrisburg, Penn. ; Cambridge, Chelsea, Quincy, Brook- 

 line, Mass.; Pawtucket, R.I. ; and various other places; while 

 the demand is constantly increasing. 



A kit of larger size, called the No. 2 kit, double the size of 

 the other, and without pads, is also made, intended for the use 

 of advanced pupils and draughtsmen. 



In connection with these instmments, the manufacturers, the 

 Milton Bradley Company of Springfield, Mass., have just put on 

 the market a support for models used in drawing (Fig. 3) . It 

 is so made that it may be attached to the ordinary school-desk, 

 and removed at pleasure. Now that form-study has become a 

 legitimate branch of every well-devised school course, there is a 

 necessity that the pupils' desks shall be properly equipped for 



the pursuit of this study, which is equally urgent with the de- 

 mand that they shall be supplied with conveniences for writing. 

 The support for drawing-models shown in the illusti-ation can 

 be readily adjusted, and easily removed from the desk at pleas- 

 ure. The wooden table on which the models rest, within easy 

 reach of the pupil sitting at the desk, is supported by a wooden 

 rod, which passes through a hole in the top of the desk, and also 

 thi'ough the shelf underneath. A metallic cam attached to the 

 top of the desk, at the corner opposite the ink-well, holds the rod 

 and the table at any desired height. The table can quickly be 

 removed from the rod, and maybe placed in the desk, or collected 

 with those from the other desks, and kept in a suitable cupboard 

 when not in use. Tlie rod is then dropped to the level of the 

 desk-top, so that nothing is seen above the desk. 



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