TRANSACTIONS OF SECTION G. 903 
3. Engineering Laboratory Apparatus. 
By Professor H. S. Hete-Suaw, If Inst.0.£. 
At the Liverpool Meeting of the Institution of Mechanical Engineers in 1891 
an account was given of the chief appliances in the Walker Engineering Labora~ 
tories at Liverpool. 
A description of the Triple-Expansion steam engine and boiler, and the alterna 
tive centre 100 ton testing Machine will be found illustrated in the Proceedings of 
the Institution of Mechanical Engineers for 1891. 
The first intention of the author on the present occasion was to give a descrip= 
tion of certain appliances which are of a novel character and which were to be 
shown in operation together with other experimental arrangements at the Walker 
Engineering Laboratories after the reading of the paper. 
These appliances might be conveniently arranged under the three following 
heads, which constituted in fact the three divisions of Laboratory teaching, viz. :— 
1. The steam engine. 
2. Hydraulics. 
3. Testing the strength and properties of materials, 
The apparatus to be mentioned under the first head were as follows :— 
1. Hydraulic brake and integrator. 
2. Spring dynamometer. 
3. Arrangement for drawing crank-effort diagrams. 
» | 4, Arrangement in connection with steam-engine indicators. 
5. General arrangements in connection with the experimental courses of 
instruction. 
Under the head of Hydraulics :— 
1. Hydraulic tank, valve-boxes and sump, 
Under the third head :— 
1. An extensometer of novel design. 
2. Arrangement for testing the torsion of shafts. 
3. A convenient gauge in connection with crushing and bending experiments. 
‘When, however, the author came to actually prepare the paper and diagrams, 
he found that it would be impossible to deal ina satisfactory manner with all 
these subjects, many of which were entirely new, all possessing novel features, 
representing the hitherto unpublished work of some years. He therefore limited 
himself to the experimental steam engine and the hydraulic tank, merely indicating 
by means of diagrams various matters without attempting to describe them fully, 
which might be seen in operation at the laboratories, where actual trials would be 
conducted by the students in the same way as during the work of the college 
classes.! bea of 
In the above-mentioned paper the brake which was described was of the 
ordinary friction type, except that the flywheel rim was hollow through which 
1 The following demonstrations were given :— 
to} 5 
1. Full trial of experimental steam engine by third year students. 
Conditions :—Triple expansion, unjacketed, condensing. Boiler pressure 100 lb. 
per square inch. Natural draught, 
2. Testing various specimens of wrought iron, and taking their stress-strain 
diagrams, in the 100-ton testing machine. 
3, Finding the deflection of beams, and value of E. 
4. Experiments on the angle of torsion, and value of coefficient of rigidity. 
5. Finding modulus ofrupture and strength of cast-iron bars. 
‘6. Gauging and cement testing. 
7. Experiments on the flow of water through orifices with the hydraulic 
tank. 
8. Drawing crank-effort diagrams by a new apparatus. 
9. Experiments on the whirling and vibration of shafts. 
