Abstract: A method for monitoring the mass of an object may include (i) applying a vibratory force to the object so that the object vibrates in whole or in part, (ii) providing a sensor or sensors configured to measure vibrations of the object in response to the force, (iii) measuring vibration data from the sensor or sensors, and (iv) comparing the vibration data or a parameter derived therefrom to reference data or one or more reference parameters, so as to determine the mass of the object or an indication that the mass of the object differs from that indicated by the reference data or one or more reference parameters. The object may, but need not necessarily, be a vehicle. The vibratory force may be provided by an integral vehicle component, for example a vehicle engine.

Abstract: An improved, light-transmitting, plastic shelter cone or terrarium is provided for the germination of seed and growth of seedlings. The cone has a lower soil-engaging flange at its base and a vent opening at its top. The vent opening is covered with a hinged flap which is an integral part of the cone and to which seed may be secured using a water soluble adhesive. When placed in the field, the flap is pressed down into engagement with sidewall indentations which hold the flap and seed in a generally vertical orientation within the cone chamber. Stiffening ribs are formed in the cone wall, protruding outwardly and forming grooves within. Seed may be secured within a groove with water soluble adhesive. When the cone is used, rainfall will dissolve the adhesive, whereby the seed may drop to the soil below. Latching the flap ensures that it does not return to block the vent opening. Preferably, the plastic is sunlight degradable and is further colored translucent red to modify the transmitted light.

Abstract: The book-type seedling container is provided with shiplap seals extending the full length of the cavity-forming shoulders, without crossover of the shiplap ledges. This shiplap structure is combined with prong-and-socket means pinning the shoulders together at their outer ends. The seal resulting from this combination gives improved resistance to penetration of seedling roots from one cell to another.